Subscribers should be allowed call-blocking services, but equally, they should be able to choose whether to accept calls from blocked numbers.
用户应当被允许使用拒收来电服务，但同样地，他们也应能够选择是否接听被阻拦号码的来电。
Some phone companies in the us already offer call-blocking service, allowing the user to block calls from Numbers that are proving a nuisance.
美国的一些电话公司已经提供呼叫限制服务，它能使用户阻挡来自骚扰者的电话。
For example, while setting up or tearing down a connection, SIP services can also implement call blocking or forwarding, as well as interface with gaming and back office systems.
举例来说，当建立或拆开连接时，SIP服务还可以实现调用的阻塞或转发，以及带有对策和事务部门系统的界面。
应用推荐